GIS微粒陷阱对绝缘子附近微米级粉尘的捕捉机制  

Capture Mechanism of Particle Trap to Micron Metal Dust near Insulators in GIS

作　　者：耿秋钰 刘耿延 杨睿成 边亚琳 李庆民[1] 王健[1] GENG Qiuyu;LIU Gengyan;YANG Ruicheng;BIAN Yalin;LI Qingmin;WANG Jian(State Key Lab of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]华北电力大学新能源电力系统全国重点实验室,北京102206 [2]中国电力科学研究院有限公司,北京100192

出　　处：《高电压技术》2025年第3期1060-1069,共10页High Voltage Engineering

摘　　要：气体绝缘封闭开关(gas-insulated switchgear,GIS)中会不可避免地产生微米级金属粉尘,从而导致沿面闪络等绝缘故障,而微粒陷阱是抑制金属粉尘的重要措施。为此通过搭建金属粉尘捕捉效果观测平台,对不同粒径粉尘的入陷行为进行观测,并从多物理场受力和碰撞能量耗散2个方面分析了微粒陷阱对金属粉尘的捕捉机制。研究表明,粉尘起始运动后在粉尘与微粒陷阱间形成无微粒区域,微粒捕捉完成后,240目粉尘在陷阱内呈“阶梯状”分布,1000目粉尘集中于陷阱边缘和靠近粉尘堆的陷阱槽中;粒径越小,范德华力和气体阻力对粉尘运动的影响越显著,范德华力提高了粉尘的起始运动电压,气体阻力降低了粉尘的运动速度,随粉尘粒径减小,粉尘起始运动电压及运动至外壳底部时的速度均出现极值;微粒陷阱对粉尘的捕捉取决于陷阱对其底部电场的降低程度和陷阱内粉尘碰撞能量耗散程度,粉尘粒径较大时,碰撞恢复系数大,粉尘与陷阱碰撞次数越多越容易被捕获;粉尘粒径较小时,碰撞恢复系数近似为0,运动至陷阱后吸附于陷阱表面且无法逃逸。Micron-sized metal dust is inevitably produced in DC gas-insulated switchgear(GIS),which can lead to insu-lation faults such as flashover.The use of particle traps is an important method to mitigate metal dust.In this paper,an observation platform to observe the trapping behavior of metal dust was built,and the capture mechanism of particle trap to metal dust was analyzed from the aspects of multi-physical field force and collision energy dissipation,based on the observation of the trapping behavior of dust with different sizes.The results showed that,after the initial movement of dust,a dust-free zone was formed between the dust and the particle trap.The 240 mesh dust was distributed in a ladder shape in the trap,and the 1000 mesh dust was concentrated at the edge of the trap and in the trap slot near the dust pile.The smaller the particle size is,the more significant the influence of the van der Waals force and gas resistance on dust movement is.The Van der Waals force increases the lifting voltage of dust,and the gas resistance reduces the velocity of dust.With the decrease of dust particle size,the extreme values of the lifting voltage of dust and the velocity when it moves to the bottom of the shell will appear.The capture effect of particle trap to metal dust depends on the trap electric field shielding effect and the trap dust collision energy dissipation within the trap.When the size of the metal dust parti-cles is large,the collision recovery coefficient is high.This leads to more frequent collisions between the dust particles and the trap,making it easier for the dust to be captured.When the size of metal dust is small,the collision recovery coef-ficient is approximately 0,and the metal dust will be adsorbed onto the trap surface and can not escape after moving to the trap.

关 键 词：气体绝缘封闭开关 绝缘子 金属粉尘 微粒陷阱 捕捉机制 

分 类 号：TM595[电气工程—电器]